"It is because the contemporary alternatives seem so one-sided and are not more evidently solutions to the problems which Thomas faced, and partly solved, that we return to him and to the tradition of theology and philosophy in which his Summa Theologiae appears: theology as the science of the first principle and this as the total knowledge of reality in its unity." -- Wayne J. Hankey, God in Himself (Oxford University Press, 1987), p.159.

Virtue is not freedom from passion because when a passion forestalls the judgment of reason, so as to prevail on the mind to give its consent, it hinders counsel and the judgment of reason; but when it follows that judgment, as though being commanded by reason, it helps towards the execution of reason's command.

The Stoics and Peripatetics disagreed on this point, as Augustine relates (De Civ. Dei ix, 4). For the Stoics held that the soul's passions cannot be in a wise or virtuous man, whereas the Peripatetics, who were founded by Aristotle, as Augustine says (De Civ. Dei ix, 4), maintained that the passions are compatible with moral virtue, if they be directed to the mean.

This difference, as Augustine observes (De Civ. Dei ix, 4), was one of words rather than of opinions. Because the Stoics, through not discriminating between the intellective appetite, i.e. the will, and the sensitive appetite, which is divided into irascible and concupiscible, did not, as the Peripatetics did, distinguish the passions from the other affections of the human soul, in the point of their being movements of the sensitive appetite, whereas the other emotions of the soul, which are not passions, are movements of the intellective appetite or will; but only in the point of the passions being, as they maintained, any emotions in disaccord with reason.

These emotions could not be in a wise or virtuous man if they arose deliberately, while it would be possible for them to be in a wise man, if they arose suddenly, because, in the words of Aulus Gellius [Noct. Attic. xix, 1, quoted by Augustine (De Civ. Dei ix, 4), "it is not in our power to call up the visions of the soul, known as its fancies; and when they arise from awesome things, they must needs disturb the mind of a wise man, so that he is slightly startled by fear, or depressed with sorrow," insofar as "these passions forestall the use of reason without his approving of such things or consenting thereto."

Accordingly, if the passions be taken for inordinate emotions, they cannot be in a virtuous man, so that he consent to them deliberately, as the Stoics maintained. But if the passions be taken for any movements of the sensitive appetite, they can be in a virtuous man, insofar as they are subordinate to reason.

Hence Aristotle says (Ethic. ii, 3) that "some describe virtue as being a kind of freedom from passion and disturbance; this is incorrect, because the assertion should be qualified": they should have said virtue is freedom from those passions "that are not as they should be as to manner and time."